Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: DNVRCOSHDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-269 A Denver CO 9636 QWEST CORPORATION 656      
303-400 A Denver CO 9636 QWEST CORPORATION 656      
303-617 A Denver CO 9636 QWEST CORPORATION 656      
303-627 A Denver CO 9636 QWEST CORPORATION 656      
303-680 A Denver CO 9636 QWEST CORPORATION 656      
303-690 A Denver CO 9636 QWEST CORPORATION 656      
303-693 A Denver CO 9636 QWEST CORPORATION 656      
303-699 A Denver CO 9636 QWEST CORPORATION 656      
303-766 A Denver CO 9636 QWEST CORPORATION 656      
720-870 A Denver CO 9636 QWEST CORPORATION 656      
720-876 A Denver CO 9636 QWEST CORPORATION 656      
720-886 A Denver CO 9636 QWEST CORPORATION 656      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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